support sandboxed rust rules

This commit adds support for compiling rust rules inside the sbox
sandbox. To compile a rust module with sandboxing enabled, the entry
point to the crate must be specified via the `crate_root` property, and
all input sources and compile-time data must be specified via the `srcs`
and `compile_data` properties.

Bug: 286077158
Change-Id: I8c9dc5cf7578037a583b4be2e2f73cf20ffd4408
diff --git a/rust/sanitize_test.go b/rust/sanitize_test.go
index 43e95f4..d6a14b2 100644
--- a/rust/sanitize_test.go
+++ b/rust/sanitize_test.go
@@ -35,7 +35,7 @@
 	note_sync := "note_memtag_heap_sync"
 
 	found := None
-	implicits := m.Rule("rustLink").Implicits
+	implicits := m.Rule("rustc").Implicits
 	for _, lib := range implicits {
 		if strings.Contains(lib.Rel(), note_async) {
 			found = Async